Paper-pulp digester



C. BREMAKER.

PAPER PEL? DIGESTER.

tented Deo. 7, 1886.

N. PETERS. Phowunwgmphw, wnmngrm n4 c UNITED STATES PATENT OEErcE.

CHARLES BREMAKER, OF LOUISVILLE, KENTUCKY.

PAPER-PULP DIGESTER.

SPECIFICATION ormng part of Letters Patent No. 353,731, dated December 7, 1886.

(No mc del.)

To all whom it may Concern.:

Be it known that I, CHARLES BREMIKER, a citizen of the United States, residing at Louisville7 in the county of Jefferson and State of Kentucky, have invented a certain new and useful Improvement in Paper-Pulp Digesters; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, forming part of this specification.

The object of my invention is so to improve the construction of pnlp-digesters that they will better resist the wear and action of chemicals and variations of heat to which they are subj ected; that their operation will be more effective and thorough, and that they may be more readily and thoroughly cleaned after use. To obtain these results I have devised the improvements hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 illustrates a central longitudinal sectional View of the apparatus; Fig. 2, an enlarged sectional view of a fragment of my improved lining; Fig. 3, an enlarged sectional view of the means for uniting the sections composing the shell or boiler, and Fig. 4: an enlarged sectional view of one of the improved standards or supports for the false bottom.

Like letters of reference in the different iigures indicate corresponding parts.

In general construction the main shell or boiler herein shown resembles that shown in the patent granted Bremaker d: Zier, Deceniber 29, 1875, and numbered 335,105.

The letter A designates the main vessel or shell, which is composed of a series of doubleflanged separable rings or sections, each having a lining, Z, which, in accordance with my present invention, consists of a woven wireeloth, A, and a sheet or sheets of lead united in the following manner: r[he wire-cloth is 'first coated with solder in the usual manner of applying it to surfaces, and the sheet or sheets of lead applied thereto, the edges being burned together. By this method the prepared sheets ODS.

the outer rings, either by burning or soldering them to said outer rings or by means of rivets or bolts B2, or both, a Washer-plate, C', being preferably employed on the inside when bolts or rivets are used. In order the more effectually to prevent leakage or liability to fracture, the washer-plates are further covered by lead plates or rings D, burned lor soldered to the lining Z. Vhen the coverings D' are employed, it may be desirable to provide a small opening, E', in the hole through which the rivet or bolt is inserted, to permit the escape of steam generated in the space between the covering D and the lining Z.

The letter B designates the false bottom. In the present instance this is vconstructed of a .main inner plate of an acid-resisting metal or alloy, covered on both faces and at all the exposed edges with plates or pieces E E, of lead. This false-bottom plate is provided with a suitable number of tapering holes, with the larger opening at the under side of the plate. The edges formi ng these holes also are provided with protecting-coverings c, of lead. It is obvious that the holes in the plate B may be cylindrical and the holes in the covering for the edges made tapering.

G designates the standard or support for the false-bottom plate B, and is composed, preferably, of an inner core, lin the form of a bolt, threaded at both ends, made of asuitable acid-resisting metal or alloy, and a suitable covering of lead. One end of the bolt is passed through the false bottom plate B and the other through the lower end or head of the vessel or boiler A. Vashers O and l? are employed on the bolt at each side of the false bottom where the bolt or standard passes through it, a securing-nut being used at the extreme upper end to hold the parts iirmly together. In order to relieve the plates E of pressure or strain at the points where the false bottom is supported by the standards, I employ pins or nubs D, cast or formed upon the inner main plate. In addition to a protecting-covering of lead, I, a ring, J, also of lead, is secured about the lower end of each standard or bolt, and in applying this ring the space K is iilled with fused solder, and when hard the lower edge is burned to the lining H and the upper edge to the covering I. The lead ring J and the lower end of the covering I may be further IOO tinned, and the space'iilled with melted lead G, the covering I being subsequently burned l l securely to said filling. This manner of forming the standards insures freedom from leakage.- p

L indicates a plate or cover, of composition or acid-resisting metal, supported upon a suitable flange or lugs, N, in the upper end of the digester. The plate in this instance is provided with holes o o', countersunk from both faces thereof to the middle, ,to avoid clogging with stock when t-he valve is opened for blowing oft' steam and gas.

rThe digester 'sections or rings are secured together at the adjacent anges by means of bolts U, and as great inconvenience'has been experienced by the action of the acid at these joints, I employ a thimble or tube,V, of sheet metal to surround the bolt at the contacting faces of the flanges. I may, in addition to this ring V, employawasher 0r ring of gum or lead, and when of the latter material it can be sol- 'l dered or burned to the flanges, so that when 3o the securing-nut is turned down upon the bolt to secure the parts together the joint will be as nearly tight as practicable. As afurther protection for the joints between the sections or rings of the digester-vesseh'l may use strips of sheet-lead Y, bent, as shown, to` permit compensation for contraction or expansion, soldered or burned to t-he linings of two adjacent sections 4over the j oint.

Theletter H designates a short pipe or chamber, connecting the digester-vessel vA and a blowzoff valve, P. This pipe .or chamber is preferably provided with a hand-hole and a removable cover for the same at its upper side, to permit the cleansing of the valve and other parts.

Q designates the valve, and S S pipes entering the valve:chamber at its upper end on either side of the valVestem.

T T are stop-cocks or valves to open and close the pipes S S, through which water or water and steam is passed for cleansing the valve, 8vo.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a pulp-digester, the herein-described perforated false-bottom plate, consisting of an acid-resisting metal plate having nubs or pins cast or formed upon one or both its faces at the points where it is supported and a lead or similar covering forsaid plate, the said nubs 2. In -a pul-p-digester, the bottom plate, B, provided with tapering holes C C, flaring downwardly, substantially as shown and described.

3. In a pulp-digester, a supporting bolt or standard for the false bottom, provided with av lead covering or ring, J, surrounding the lower end, soldered to said lead covering and to the lining of the digester-head, masses of solder M and G, applied at the bottom and top, respectively, in the manner and for the purposeset forth.

4. In a paper-pulp digester, the plate L in the upper end of the digester-boiler, provided with holes O, 'contracting inwardly from both faces, substantially as and-.for the purpose set forth.

5. In a pulp digester, the combination, with the main vesselv or boiler A and a blow-off valve, of the pipe or chamber H, connecting the two, provided with an opening to permit the removal of stock lodged therein, and a removable cover for said opening, las set forth.

6. In a pulp-diges`ter, the combination, with the blow-off valve, of the pipes S S, for introducing steam or water under pressure into` said valve to cleanse the same, and stopcocks or valves T T, to regulate the flow in said pipes, as set forth.

7. 4In a pulp-digester, the combination, with .the securing-boltsor like fastening devices U,

of the metal thimbles V and suitable rings or washers, W, surrounding said bolts or fastening devices, as and for the purpose set forth.

8. In a pulp-digestena lining, Z, composedI of a sheet of wire-cloth and a sheet or sheets of' lead, and an intermediate filling of solder for uniting the said sheets, substantially asdescribed.

9. Ina pulp-digester, the improved means -or pins projecting through the covering toor `near its surface, for the purpose set forth.

IOC'

herein described for securing the lining in place, consisting of the countersunk head-rivets B2, corresponding holes in the lining and outer shell, and the washer-plates C on the inner end of said rivets, a groove or opening, E',

and a covering, D', substantially as set Iforth.

CHARLES BREMAKER.

Witnesses:

GEORGE HAMMER, FRANK PARDON. 

